.tooltip-inner{background-color:#000 !important;/*!important is not necessary if you place custom.css at the end of your css calls. For the purpose of this demo, it seems to be required in SO snippet*/color:#fff !important;font-size:12.5px !important}.tooltip.bs-tooltip-auto[x-placement^=top] .arrow::before,.tooltip.bs-tooltip-top .arrow::before{margin-left:-3px;content:"";border-width:5px 5px 0;border-top-color:#000}.tooltip.bs-tooltip-auto[x-placement^=right] .arrow::before,.tooltip.bs-tooltip-right .arrow::before{margin-top:-3px;content:"";border-width:5px 5px 5px 0;border-right-color:#000}.tooltip.bs-tooltip-auto[x-placement^=bottom] .arrow::before,.tooltip.bs-tooltip-bottom .arrow::before{margin-left:-3px;content:"";border-width:0 5px 5px;border-bottom-color:#000}